PAD plotting tests

Rendering OK in HTML output tests 10/11/22, even if broken in JupyterLab render.

import epsproc as ep

# Set specific LM coeffs by list with setBLMs, items are [l,m,value]
from epsproc.sphCalc import setBLMs

BLM = setBLMs([[0,0,1],[1,1,1],[2,2,1]])   # Note different index
# BLM

# Set the backend to 'pl' for an interactive surface plot with Plotly
ep.sphFromBLMPlot(BLM, facetDim='t', plotFlag = True, backend = 'pl');

OMP: Info #271: omp_set_nested routine deprecated, please use omp_set_max_active_levels instead.

* sparse not found, sparse matrix forms not available. 
* natsort not found, some sorting functions not available. 

* Setting plotter defaults with epsproc.basicPlotters.setPlotters(). Run directly to modify, or change options in local env.
* Set Holoviews with bokeh.
* pyevtk not found, VTK export not available. 
Using complex betas (from BLMX array).
*** WARNING: plot dataset has min value < 0, min = (-0.1395565615548185+0.12053438305698214j). This may be unphysical and/or result in plotting issues.
Sph plots: 
Plotting with facetDims=t, pType=a with backend=pl.
*** Plotting for [1,1,0]